In my experience, academics are almost always expected to contribute some of their time to activities beyond their principal teaching or research roles. These extra tasks include, for example, attending open days, visit days, serving on one or more committees, acting as head of a student year group, admissions officer - the list is long.
Whether this should be the case is not in question here.
In one of my previous institutions, there was in place a "brownie-point" system which was supposed to keep a track of how much extra administrative/organisational/outreach or otherwise "extra-mile" work an academic had taken on. When a new task required action, the academics could use their accumulated points to argue why they shouldn't (or indeed should, in some cases) be allocated the task. Setting the value of a task relative to all the others, as you might imagine, raised some difficulties.
My question is: has anyone experience of any other kind of formalised system of evaluating and allocating these "extra-mile" tasks?